package exception2;

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

public class test {
    public static void main(String[] args) throws RuntimeException {
       // set
        if(true){
            int a=2/0;
            throw new  RuntimeException();
        }


        HashMap<Integer,String> ss=new HashMap<>();
        ss.put(4,"lll");
        ss.put(null,"klk");
        System.out.println(ss.get(null));
        fun(1);
        fun();
    }
    static final void fun(){

    }
    static final int fun(int a){
     return  a;
    }
}
